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The role of the QBO in the inter-hemispheric coupling of summer mesospheric temperatures
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2011 (English)In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 11, no 2, 495-502 p.Article in journal (Refereed) Published
Abstract [en]

Inter-hemispheric coupling between the polar summer mesosphere and planetary-wave activity in the extra-tropical winter stratosphere has recently been inferred using Polar Mesospheric Cloud (PMC) properties as a proxy for mesospheric temperature (Karlsson et al., 2007). Here we confirm these results using a ten-year time series of July mesospheric temperatures near 60 degrees N derived from the hydroxyl (OH) nightglow. In addition, we show that the time-lagged correlation between these summer mesospheric temperatures and the ECMWF winter stratospheric temperatures displays a strong Quasi-Biennial Oscillation (QBO). The sign and phase of the correlation is consistent with the QBO modulation of the extra-tropical stratospheric dynamics in the Southern Hemisphere via the Holton-Tan mechanism (Holton and Tan, 1980). This lends strength to the identification of synoptic and planetary waves as the driver of the inter-hemispheric coupling, and results in a strong QBO modulation of the polar summer mesospheric temperatures.

Place, publisher, year, edition, pages
2011. Vol. 11, no 2, 495-502 p.
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Meteorology and Atmospheric Sciences
Identifiers
URN: urn:nbn:se:su:diva-68673DOI: 10.5194/acp-11-495-2011ISI: 000286722300006OAI: oai:DiVA.org:su-68673DiVA: diva2:472950
Note
authorCount :5Available from: 2012-01-04 Created: 2012-01-04 Last updated: 2017-12-08Bibliographically approved

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